# US 11,307,342 B2 · Optical collimation assembly, backlight module and display device

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- Number: US 11,307,342 B2
- Document ID: US11307342B2
- Status: Granted
- Kind: B2
- Application number: 16/966,798
- Filed: 2020-02-17
- Published: 2021-07-29
- Granted: 2022-04-19
- Earliest claimed: 2019-03-26
- Assignees: Hefei Boe Optoelectronics Technology Co., Ltd.; Boe Technology Group Co., Ltd.
- Applicants: Hefei BOE Optoelectronics Technology Co., Ltd.; BOE Technology Group Co., Ltd.
- Inventors: Hai Tang; Liang Gao; Yong Hu; Jianwei Qin
- Web page: https://patentgrep.com/patent/US11307342B2

## CPC

- G02B 6/002: {by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces}
- G02B 6/0056: {for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements}
- G02B 5/0231: {the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045)}
- G02B 5/045: {Prism arrays}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources}
- G02B 27/30: Collimators
- G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces}
- G02B 6/0061: {to provide homogeneous light output intensity}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical collimation assembly, a backlight module and a display device are disclosed. The optical collimation assembly includes: a collimation film including a light incident surface and a light exiting surface; and a light modulation component, located on the light incident surface of the collimation film and includes a plurality of light modulation portions arranged in an array. Each of the plurality of light modulation portions includes: a first surface; a second surface; and a third surface intersecting both the first surface and the second surface, an included angle between the third surface and the first surface is an acute angle, wherein the third surface is configured to reflect light entering the light modulation portion from the second surface, such that the light being reflected exits from the collimation film along a direction substantially perpendicular to the light exiting surface.

## Claims

### Claim 1

An optical collimation assembly, comprising:
a collimation film, the collimation film comprising a light incident surface and a light exiting surface; and
a light modulation component, the light modulation component being located on the light incident surface of the collimation film and consisting essentially of a plurality of light modulation portions arranged in an array, each of the plurality of light modulation portions comprising:
a first surface close to the light incident surface;
a second surface configured to be opposite to the first surface and be away from the light incident surface; and
a third surface intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an acute angle,
wherein the third surface is configured to reflect light entering the light modulation portions from the second surface, such that the light being reflected exits from the collimation film along a direction substantially perpendicular to the light exiting surface,
wherein a dimension of each of the plurality of light modulation portions in a direction parallel to a plane where the collimation film is located is gradually increased along a direction pointing from the light incident surface to the light exiting surface.

### Claim 2 (depends on 1)

The optical collimation assembly according to claim 1, wherein the third surface comprises a conical surface.

### Claim 3 (depends on 2)

The optical collimation assembly according to claim 2, further comprising: a fourth surface, wherein the fourth surface intersects both the first surface and the second surface, the fourth surface and the conical surface are connected with each other, and the fourth surface is a planar surface.

### Claim 4 (depends on 3)

The optical collimation assembly according to claim 3, wherein an included angle between the fourth surface and the first surface is a right angle, and each of the plurality of light modulation portions has a shape of a semi-circular truncated cone.

### Claim 5 (depends on 4)

The optical collimation assembly according to claim 4, wherein:
the plurality of light modulation portions are arranged at equal intervals along a first direction, the first direction is parallel to the plane where the collimation film is located,
each of the plurality of light modulation portions has a first cross section in a plane which is perpendicular to the plane where the collimation film is located and parallel to the first direction, and
the first cross section is in a shape of a right trapezoid.

### Claim 6 (depends on 5)

The optical collimation assembly according to claim 5, wherein an included angle between the first surface and a tangent line of each point on the third surface is an acute angle in the first cross section.

### Claim 7 (depends on 6)

The optical collimation assembly according to claim 6, wherein orthographic projections of any two adjacent light modulation portions arranged along the first direction on the light incident surface are in direct contact with each other.

### Claim 8 (depends on 5)

The optical collimation assembly according to claim 5, wherein:
the plurality of light modulation portions are arranged at equal intervals along a second direction, the second direction is parallel to the plane where the collimation film is located,
each of the plurality of light modulation portions has a second cross section in a plane which is perpendicular to the plane where the collimation film is located and parallel to the second direction,
the second cross section is in a shape of an isosceles trapezoid, and the second direction is perpendicular to the first direction.

### Claim 9 (depends on 8)

The optical collimation assembly according to claim 8, wherein orthographic projections of any two adjacent light modulation portions arranged along the second direction on the light incident surface are in direct contact with each other.

### Claim 10 (depends on 9)

The optical collimation assembly according to claim 9, wherein:
the collimation film and the light modulation portions are fabricated into separate parts,
the collimation film comprises an organic insulating material, and
the light modulation portions comprise a curable organic insulating material.

### Claim 11

A backlight module, comprising:
a light guide assembly, the light guide assembly comprising a light guide plate, the light guide plate comprising a light exiting side and a rear side opposite to the light exiting side; and
an optical collimation assembly, the optical collimation assembly being stacked with the light guide plate and located at the light exiting side of the light guide plate, wherein the optical collimation assembly comprises:
a collimation film, the collimation film comprising a light incident surface and a light exiting surface; and
a light modulation component, the light modulation component being located on the light incident surface of the collimation film and consisting essentially of a plurality of light modulation portions arranged in an array, each of the plurality of light modulation portions comprising:
a first surface close to the light incident surface;
a second surface configured to be opposite to the first surface and be away from the light incident surface; and
a third surface intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an acute angle,
wherein the third surface is configured to reflect light entering the light modulation portion from the second surface, such that the light being reflected exits from the collimation film along a direction substantially perpendicular to the light exiting surface,
wherein the light modulation component is located between the collimation film and the light guide plate,
wherein a dimension of each of the plurality of light modulation portions in a direction parallel to a plane where the collimation film is located is gradually increased along a direction pointing from the light incident surface to the light exiting surface.

### Claim 12 (depends on 11)

The backlight module according to claim 11, wherein the light modulation component is configured to reflect total reflection light that exits from the light guide plate and enters the light modulation component, and to allow the total reflection light to exit from the collimation film along a direction substantially perpendicular to the light exiting surface.

### Claim 13

The backlight module according to 12, further comprising: a light source, wherein the light source is disposed at a lateral side of the light guide plate and is configured to emit incident light towards the light guide plate,
the light guide assembly further comprising a reflecting component, wherein the reflecting component is disposed at the rear side of the light guide plate and configured to reflect part of the incident light into the light modulation component in a total reflection manner.

### Claim 14 (depends on 13)

The backlight module according to claim 13, wherein the reflecting component comprises a plurality of prisms, the plurality of prisms are arranged at a density which is gradually increased along a direction facing away from the light source.

### Claim 15 (depends on 14)

The backlight module according to claim 14, wherein each of the plurality of prisms comprises:
a bottom surface parallel to a plane where the light guide plate is located; and
a first prism surface, a second prism surface and two third prism surfaces, wherein the first prism surface and the second prism surface are inclined with respect to the bottom surface, the first prism surface and the second prism surface intersect each other, the two third prism surfaces are opposite to each other, each of the two third prism surfaces intersects all of the first prism surface, the second prism surface, and the bottom surface.

### Claim 16 (depends on 15)

The backlight module according to claim 15, wherein:
an included angle between the first prism surface and the bottom surface is α, and 1°<α<10°, and
an included angle between the second prism surface and the bottom surface is δ, and 30°<δ<90°.

### Claim 17 (depends on 16)

The backlight module according to claim 16, wherein the two third prism surfaces have a same included angle γ with respective to the bottom surface, and 25°<γ<90°.

### Claim 18 (depends on 11)

The backlight module according to claim 11, further comprising an optical adhesive layer, wherein the light guide plate is bonded to the light modulation component through the optical adhesive layer, and
a refractive index of the light guide plate and a refractive index of the light modulation component both are greater than a refractive index of the optical adhesive layer.

### Claim 19

A display device, comprising:
a backlight module, the backlight module comprising:
a light guide assembly, the light guide assembly comprising a light guide plate, the light guide plate comprising a light exiting side and a rear side opposite to the light exiting side; and
an optical collimation assembly, the optical collimation assembly being stacked with the light guide plate and located at the light exiting side of the light guide plate, wherein the optical collimation assembly comprises:
a collimation film, the collimation film comprising a light incident surface and a light exiting surface; and
a light modulation component, the light modulation component being located on the light incident surface of the collimation film and consisting essentially of a plurality of light modulation portions arranged in an array, each of the plurality of light modulation portions comprising:
a first surface close to the light incident surface;
a second surface configured to be opposite to the first surface and be away from the light incident surface; and
a third surface intersecting both the first surface and the second surface, an included angle between the third surface and the first surface being an acute angle,
wherein the third surface is configured to reflect light entering the light modulation portion from the second surface, such that the light being reflected exits from the collimation film along a direction substantially perpendicular to the light exiting surface,
wherein the light modulation component is located between the collimation film and the light guide plate,
wherein a dimension of each of the plurality of light modulation portions in a direction parallel to a plane where the collimation film is located is gradually increased along a direction pointing from the lit incident surface to the light exiting surface.

### Claim 20 (depends on 19)

The display device according to claim 19, further comprising:
a display panel, located at a side of the optical collimation assembly away from the light guide plate, wherein light emitted from a light source passes through the light guide plate and the optical collimation assembly, and then enters the display panel.